1 // Copyright (C) 2015-2019 Free Software Foundation, Inc.
2 //
3 // This file is part of the GNU ISO C++ Library.  This library is free
4 // software; you can redistribute it and/or modify it under the
5 // terms of the GNU General Public License as published by the
6 // Free Software Foundation; either version 3, or (at your option)
7 // any later version.
8 
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 // GNU General Public License for more details.
13 
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3.  If not see
16 // <http://www.gnu.org/licenses/>.
17 
18 // { dg-do run { target c++11 } }
19 
20 #include <memory>
21 #include <testsuite_hooks.h>
22 
23 struct X : public std::enable_shared_from_this<X> { };
24 
25 bool
share_ownership(const std::shared_ptr<X> & p1,const std::shared_ptr<X> & p2)26 share_ownership(const std::shared_ptr<X>& p1, const std::shared_ptr<X>& p2)
27 {
28   return !p1.owner_before(p2) && !p2.owner_before(p1);
29 }
30 
31 void
test01()32 test01()
33 {
34   std::shared_ptr<X> p1(new X);
35   VERIFY( share_ownership( p1->shared_from_this(), p1 ) );
36   {
37     std::shared_ptr<X> p2(p1.get(), [](X*){});
38     // The weak_ptr member of the enable_shared_from_this base should not
39     // be reset by creating a second control block that owns the pointer.
40     VERIFY( share_ownership( p2->shared_from_this(), p1 ) );
41   }
42   VERIFY( share_ownership( p1->shared_from_this(), p1 ) );
43 }
44 
45 int
main()46 main()
47 {
48   test01();
49 }
50